Control device for oil coolers



Sept. 30, 1947. R. w. JEN SEN CONTROL DEVICE F QR OIL COQLERS 2 FiledAug. @1944 s shee s-sheet 1 ISnvcntor RAYMOND W. vJENSEN C(ttorneg Sept.30, 1947. R. w. JENSEN CONTROL DEVICE FOR OIL CQOLERS 3 Sheets-Sheet 3Filed Aug. 5. 1944 RAYMOND w. JENSEN CONTROL DEVICE FOR E1 UGGLERSRaymond W. Jensen, Los Angeles, Calif assignor to The GarrettCorporation, Airesearch Manufactoring Company division, Balm, acorporation of California Los Angeles,

Application August 5, 1944, Serial No. 548,220

8 Claims. (Cl. 236-34) y invention relates to equipment for cooling Ithe oil which is used for crankcase lubrication of internal combustionengines.- This oil serves a dual function. It lubricates moving parts,and also absorbs heat. It is a practice, especially where internalcombustion engines are employed in aircraft, to circulate the hot engineoil through an oil cooler to remove therefrom the heat which has beenabsorbed from the engine parts.

tit is an object of the present invention to provide a flow control unitwhich may be connected to an oil cooler to provide a means whereby thepiping of the engine oil circulating system may be connected to thecooler and whereby the flow 03 oil in the circulating system may becontrolled so as to travel through different paths in accordce withdifierent temperatures and pressures in the oil.

It is also an object oi the invention to provide a flow control unit foran oil cooler which may be installed in an oil circulating system inaccordance with a number of difierent plans of locatlon and connectionof the oil circulating conduits.

' A further object of the invention is to provide a unit which may beconnected to an oil cooler having an inlet to receive the oil and anoutlet through which 011 is discharged, this unit having therein meansfor controlling the flow of oil, so that when the oil in the engine iscold, it will be diverted directly from the inlet to the outlet, andtherefore the cold oil will not be forced through ages associated withthe cooler. In addition to the foregoing the device has therein meanscontrolled by a thermostat for directing warm or hot oil from the engineinto passages associated with the cooler. Also, the invention provides aJr which may be in heat-exchange relation to the cooler and means forcontrolling the flow oi oil through this bypass.

A further object of the invention is to provide in this oil flow controlunit an arrangement whereby the cold oil from the engine is directed chto the engine without passing through the cooler, and wherein the warmor hot oil from the e is passed through the cooling chambers of thecooler and is then delivered to piping which will carry the cooled oilto a reservoir.

A further object is to rovide a control of the character set forth inthe preceding paragraphs which may be readily converted at the locationof its use so that it may be installed in the system wherein all of theoil received from the engine is ultimately discharged into a pipeleading to a reservoir.

A further object of the invention is to provide a flow control having asimple thermostatic valve device in its inlet chamber for directing theoil from the engine either to the outlet or into the inlet of the cooleror to the cooler inlet and the inlet of a warm up passage associatedwith the cooler after which a thermostatic means associated with thewarm up passage and the outlet of the cooler determines the flow throughthe warm up passage and the interior of the cooler.

A further important object of the invention is to provide a control unithaving a wide usefulness which is simple and compact, and includescooperating parts which, though emcient in their operation, may bemanufactured relatively rapidly and economically.

Further objects and advantages of the invention will be brought out inthe following part of the specification.

Referring to the drawings which are for illustrative purposes only,

Fig. 1 is a schematic perspective view showing a manner in which theinvention may be employed to connect an oil cooler into an engine oilcirculating system including an oil reservoir.

Fig. 2a is a diagram showing the flow of engine oil under one condition.

Fig. 2b is a diagram showing the flow of engine oil under anothercondition.

Fig. 2c is a diagram showing the how of engine oil under a thirdcondition, referred to as the normal operation of the cooler.

Fig. 3 is an enlarged longitudinal section through the control, thisview showing the fitting on the upper part of the cooler, by whichconnection of the control to the cooler is made.

Fig. d is a cross section taken as indicated by the line t-d of Fig. 3.

Fig. 5 is a cross section taken as indicated by the line MB of Fig. 3.

Fig. 6 is a cross section taken as indicated by the line t-t of Fig. 3.

Fig. '7 is a, longitudinal section taken as indicated by the line 'l-iof Fi 3.

Fig. 8 is a fragmntary plan view taken as indicated by the line of Fig.3.

In Fig. l i show my control unit it mounted on an oil cooler Ii having acooling section 92 of cylindric form and having around the coolingsection i2 a hollow annular muff i3 comprising a warm up chamber. Anengine it and a reser voir it are respectively schematically indicated.Oil from the engine is delivered by a pump it through a pipe ii to aninlet opening it, Fig. 3, in the top of the control unit it]. The flowof oil through the piping I1 is indicated by arrows 19. If the oil iscold, as occurs when the engine is started after a period of non-use,the control unit In diverts the oil from the cooler l2 back to theengine through a direct return pipe 20 as indicated by the heavy arrows2i. After the engine has heated the oil, the control unit ultimatelyacts to direct the oil through the body or cooling section 12 of thecooler H, as indicated by dotted arrows 22, and then through outletpiping 23 to the reservoir l from which the cooled oil passes to theengine as needed through piping 24.

The preferred form of the invention is adapted to control the flow ofoil from the engine as indicated in Figs. 2a, 2b, and 20. As shown inFig. 2a, when the oil from the engine as indicated by arrows I9, iscold, such oil is diverted directly back to the engine, as indicated byarrows 2|. As shown in Fig. 21), after the oil from the engine, asindicated by arrows I9, has warmed up, such oil, prior to the warming upof the cooler section l2 of the oil cooler i l, is passed through themuff or warm up space l3 as indicated by arrows 25, and is thendelivered through the reservoir I5 back to the engine l4, as indicatedby arrows 26. As indicated in Fig. 20, after the cooling'section l2 ofthe cooler has warmed up, the control unit I 0 acts to discontinue theflow of oil through the warm up passage l3, and to direct the oilthrough the cooling section l2, as indicated by arrows 22, after whichthe oil passes back to the reservoir, as indicated by arrows 26'.Additional valuable functions of the control unit l0 include the closingof valves automatically so as to entirely isolate the cooler H from thepressure piping in event that an excess pressure develops in the pipingII, and should an excessive back pressure be developed in the coolingsection 2 against relatively free flow of the oil as indicated in Fig.2c, the oil will be diverted from the interior of the cooler section l2,through the bypass formed by the mull l3, so that the oil will then flowas indicated by arrows 25 in Fig. 2b, until the cooling section l2 haswarmed up sufficiently to permit a normal flow through the coolingsection, as indicated by the arrows 22' of Fig. 2c.

As shown in Fig. 3, the control unit Ill comprises a shell 21 having inthe upper part thereof an inlet chamber 28 and an outlet space 29 injuxtaposition and connected by a valve opening 30. Below the inletchamber 28 there is a cooler inlet space 3| having in the lower partthereof a cooler inlet port 32 for connection to the inlet space 33 ofthe cooler II, formed within the fitting 34 of the cooler. The coolerinlet space 3| extends upward along the leftward end of the inletchamber 28 and is connected through the inlet chamber 28 through a valveopening 35. In the end wall 36 of the shell 21 there is an opening 3'!to receive a fitting 38 which will be hereinafter described.

In the shell 21, below the outlet space 29, there is a cooler outletchamber 39 which communicates through a port 40 with the cooler outlet4|, and which communicates with the outlet space 29 through anintercommunicating valve port 42. Between the space 3i and the chamber39 there is a bypass space 43, the lower end of which communicates withthe muff outlet 44 and the upper portion of which communicates with theoutlet chamber 39 through ,a valve opening 45. In the outer wall of theshell 21 opposite the valve opening 45 there is an opening 46 arrangedto be closed by a cap 41 having a cylindrical wall 48 which extends intothe opening 46, and is axially aligned with the valve opening 45. Thiscylindrlc wall 48 receives in slidable relation the base 49 of athermostatic valve device 50 which is constructed as shown in mycopending application, Serial No. 519,159, filed January 21, 1944, nowPatent No. 2,405,831, dated August 13, 1946. It comprises a support 5!which projects from the base 49 toward the valve opening 45 and has onthe forward end thereof a plate or piston 52 of approximately the samediameter as the valve opening 45 and in spaced relation to the opening45. A cylindric valve element 53 is slidable on the piston 52 from theposition in which it is shown in Fig. 3, leftward into a positionwherein the valve opening 45 will be closed. The movement of thecylindric valve element 53 on the piston 52 is accomplished by abi-metallic thermostat element 54 made in the form of a spiral. Theinner end of the thermostat 54 is connected to the support 5| and theouter end of the thermostat 54 is connected through lever means 55 withthe projecting portion 56 of the cylindric valve element 53, and thethermostat 54 acts in response to a rise in its temperature to move thecylindric valve element 53 leftward so as to close the valve opening 45.Accordingly, when the oil which contacts the thermostat 54 is cold, asmay occur under various circumstances, the thermostat 50 will retain thevalve element 53 in its open relation to the valve opening 45 so thatoil may flow through the bypass space 43 through the valve opening 45into the chamber 39 and outward through the intercommunicating port 42and the outlet space 29.

In the inlet chamber 28 there is a thermostatic valve device 51 forcontrolling the flow of oil through the valve openings 30 and 35. Thisvalve device 5'! comprises a. support 58 which includes a plunger 59slidable in the bore 50 of the fitting 38. The fitting 38 has aperforate cylindric wall GI whichprojects through the opening 31 andacross the upper portion of the cooler inlet space 3| as shown in Fig.3, and forms an annular seat 62 in the opening 35. The plunger portion59 of the support 58 has on its inner end a circular plate or piston 63of approximately the same diameter as the opening through the valve seat62. A snap ring 64 on the outer end of the plunger 59 limits the inwardmovement of the plunger 59 and a compression spring 65 disposed betweenthe end of the fitting 38 and the piston 63, urges the piston 63 inwardto a position spaced from the valve seat 6|. The support 58 includesalso a bifurcated member 66 axially aligned with the plunger 59 andcarrying in rotatable relation a pin 6'! which may be rotated forpurpose of adjustment by a lever 68 which is fixed on the outer end ofthe pin 61 and has therein an arcuate slot 69 through which a clampingscrew 10 projects for the purpose of securing the lever 68 in selectedpositions of adjustment. A thermostat element H comprising a coil ofoi-metallic thermostat material has its inner end fixed on the pin ST.The thermostat element H is disposed between the two sides of thebifurcated member 86 and has its outer end secured by means of a crosspin 72 to a pair of levers 13, which are curved and have their oppositeends connected by means of a pivot pin 14 to arms which project from thebifurcated supporting member 66 in a direction opposite the outer end ofthe thermostatic element H. Change in temperature of the thermostatelement H causes the outer end thereof to move and swing the levers 18on the pivot pin It. Adjacent the end oi the support 58 nearest thevalve opening 88 there is "a second piston I6 having a diametersubstantially the same as the diameter of the valve opening 38. Thispiston 18 has a stem I? which is received in an opening I8 in'an arm IIIwhich projects inward toward the center of the opening 38 from one sidethereof, the opening l8 being coaxial with the plunger 59. The piston i6is supported in a position spaced from the valve opening 38.

A cylindric valve element 18 is slidable on the piston 68 in closelyfitting relation thereto. This 'cylindric valve element I8 has anannular end portion 88 to cooperate with the seat 62 so as to close thevalve opening 35 as shown in Fig. 3. On .the piston 16 there is a secondcylindric valve element 8| having an annular end portion 82 to cooperatewith the opening 38 for the'pur- ,pose of closing the same. From thecylindric .valve elements '19 and 8| arms 88 and 88 extend intooverlapping relation as shown in Fig. '7. These arms or extensions 83and 88 are connected by means of pins 85 to the central portions of thelevers I3 so that when the levers I3 are swung by the thermostat elementII, the valve elements I9 and ill will be simultaneously moved in thesame direction. When the oil in the inlet chamber 28 is cold, thethermostat element II will hold the cylindric valve element I5 in aposition to close the first valve opening 15 and will hold the secondcylindric valve element H in a position to open the second valve opening38 of the chamber 28. When the oil in the chamber 28 warms up to atemperature near the normal operating range, the response of thethermostat II will move the valve elements 19 and 8| rightward from thepositions in which they are shown in Fig. 3, so as to open the firstvalve opening 38 and close the second valve opening 38 of the chamber28.

As best shown in Fig. '7, a pair of walls 88 extend inward from the sidewall of the outlet space 28 so as to divide this outlet space 28 into afirst outlet compartment 81 and a second outlet compartment 88. Theinner vertical edges 88 of the walls 86 define a gate 98 connecting thecompartments 81 and 88. A cylindric partition member 8i is provided toclose the gate 88 so that the compartments 8'! and 88 may be selectivelyisolated, one from the other. This cylin- .dric partition member 9| isinsertable through first outlet opening 82 which leads into the outletspace 29 through the upper wall thereof and extends into engagement withan annular channel 93 formed around the intercommuni- 'cating port 82.When the partition member 8| is positioned as shown in Fig. 7, acontinuous wall portion 98 thereof closes the gate 88, and open. ings 85in the wall of the partition member 8 I connect the interior of thecylindric partition member 9| with the compartment 87. As shown in Fig.8, the upper end of the cylindric partition member 8I has therein ashallow notch 86 through which a tongue 81 projects from a springretaining ring 98 into a recess 99 formed in the wall surrounding theoutlet opening 92. Accordingly, the position of the tongue 97 determinesthe position of the cylindric partition member 8|.

The wall of the shell 2'! surrounding the opening 92 has a second recessor depression I88 to receive the tongue 81. The cylindric member 8I maybe rotated on its axis so as to bring the notch 96 at its upper end intoalignment with the recess I88, and the ring 98 may be then turned sothat its tongue 81 will extend through the notch 88 into the recess I88so as to hold the cylindric member M in a second position, wherein theopenlugs 88 will connect the compartment 88 with the interior of thecylindric member M, with the compartment 81 and withthe outlet opening88. As shown in Fig. 7, the shell 21 has a second outlet opening I8Ileading out through the side wall of the outlet space 29 so as tocommunicate with the compartment 88.

The spring retaining ring 88 has inwardly projecting fingers I82 toengage the upper end of a compression spring I88 which exerts downwardpressure against a cup shaped check valve member I84 which is verticallyslidable in the lower portion of the cylindric member 9| and cooperateswith the intercommunicating port 42 so as to prevent a reverse flowtherethrough. The valve member I84 has windows I85 in the side wallthereof. In addition to the upper inlet opening I8, the inlet chamber 28has a second laterally directed inlet opening I88, so that connection tothe inlet chamber 28 may be made either from above or from the side, asmay be required by space considerations in the mounting of the coolerwithin an aircraft. It will be understood that the inlet opening notused will be covered by a plate. In Fig. 1 the oil inlet piping I1 isshown connected in full lines to the upper inlet opening I8, and asindicated by dotted lines I8'I, the inlet piping may be connected to thechamber 28 through the laterally directed inlet opening I86, shown inFigs.

5 and 7.

The partition member Si is shown disposed in Figs. 3 and ,7 so that thecontrol unit may be employed in an oil circulating system such as shownin Fig. 1. The thermostatic valve devices 58 and 51 are shown in Fig. 3in the positions which they assume when the oil in the control unit I 8is cold. At this time the first valve opening 88 of the chamber 28 isclosed and the second valve opening 38 is open. Likewise, the valveopening 45 is open due to the fact that both the thermostatic elementsII and 58 are exposed to relatively low temperature. The oil whichenters the chamber 28 from the piping H of Fig. 1 may flow directlythrough the valve opening 88 into the second compartment 88 from whichit will pass through the outlet I8I into the direct return piping28,connected to the engine. As the oil is warmed up in consequence ofthe operation of the engine, the thermostat element II will act to movethe valve elements I8 and 8| in rightward direction so as to open thefirst valve opening35 and close the second valve opening 88, so that theinlet oil will be directed into the inlet space 8i which, as shown inFig. 4, communicates through the cooler inlet space 88 of the fitting-88with the cooler inlet opening I88 and with one end of the muff interiorI89. If the oil in the cooling space I2 of the cooler is quite cold atthis time, there will be some resistance to the flow of oil through thecooling section It and the oil moving downwardly from the inlet space 8Iwill naturally follow the path of least resistance which is through theinterior space I88 of the mud I8 as indicated by arrows I118 of Figs. 4and 5. Since the valve element 83, Fig. 3, is in retracted position, theoil may flow upward from the space 84 through the bypass 88 and throughthe valve opening 88 into the cooler outlet chamber 88. The pressure ofthis oil will lift the valve I88 and. the oil will then flow upwardthrough the first compartment Bl and through the first outlet opening 92to the piping 28, Fig. l,

7 which will carry the oil to the reservoir IS. The path of flow of oilat this time will be as indicated schematicallyin Fig. 2b.

The warm oil, passing through the muff l3, as indicated by arrows I H)of Figs. 4 and 5, will transmit heat to the oil in the cooling sectionI! so as to warm this oil and permit a movement thereof. At this time,then, oil will start to flow through the inlet opening I08 oi thecooling section l2, through the passages of this cooling section andthen out through the cooling section through the outlet 4i and theoutlet chamber 39. This warm oil will act upon the thermostat element 54to cause it to move the valve element 53 into a position to close thevalve opening 45 and shut off the fiow through the bypass 43. The entireflow of oil will be thereafter through the cooling space of the coolerand through the reservoir l as shown schematically in Fig. 20.

If, during the operation of the cooling system, as shown in Fig. 20,there should be a sudden reduction in temperature in the cooling sectionI! of the coolerso that congealment of oil therein will create a backpressure, the pressure build up in the bypass will act against thepiston 52, Fig. 3, to force the entire valve device 50 in rightwarddirection against the pressure of a spring H2 which is disposed betweenthe base #9 and the end wall of the cap 41. This will shift the valveelement 53 rightward so as to open the valve opening 45 and'permit oilto bypass through the mud I3 until the condition of congealment of oilin the cooling section l2 of the cooler has been corrected. Also, shouldan excess pressure be built up in the inlet chamber 28 for any reason,such pressure will act leftward against the plunger 59 to move thethermostatic valve device '51 leftward, thereby closing the first valveopening 35 and opening the valve opening 30, so that the inlet chamber28 will be cut off from the space 3| which communicates with the coolerand permit a, direct return of oil through the opening ,30 and thesecond compartment 88 to the piping 20 which leads to the engine 14.

Should it be desired to direct all of the oil from the valve device l0through the pipe 23 to the reservoir IS, the outlet HH, Fig. '7, may beclosed by cover plate and the cylindric partition 9i, Figs. 3 and 7, maybe rotated into a position wherein the compartment 88 will be connectedwith the compartment 81. Then, any oil which passes from the chamber 28through the valve opening 30, and all oil which passes through the valveOpening 42, will be conducted through the piping 23 to the reservoir I5.

I claim as my invention:

1. In a flow control for an oil cooler having an inlet and an outlet forthe oil, the combination of: walls forming an inlet chamber connectedthrough a valve opening to a cooler inlet port arranged for connectionto the cooler inlet, an outlet space connected to said inlet chamberthrough a second valve opening, a cooler outlet chamber connected tosaid outlet space through an intercommunicating port and having a,cooler outlet port arranged to connect said outlet chamher with saidoutlet of said cooler, and bypass means to provide communication betweensaid cooler inlet port and said cooler outlet chamber; a valve device insaid inlet chamber comprising supporting means having a first pistonspaced from and aligned with said first valve opening, a second pistonspaced from and aligned with said second valve opening, a firstcylindric valve element slidable on said first piston and having an formoving said second valve element toward said second valve opening inresponse to an increase in the temperature of said oil in said inletchamber; means operating in response to excess pressure in said inletchamber to move said first valve element into closed relation to saidfirst valve opening; and thermostat valve means in said outlet chamberoperative in response to a rise in temperature in said outlet chamber toclose said bypass means.

2. In a flow control for an oil cooler having an inlet and an outlet forthe oil, the combination of: walls forming an inlet chamber connectedthrough a valve opening to a cooler inlet port arr nged for connectionto the cooler inlet, an outlet space connected to said inlet chamberthrough a second valve opening, and a cooler outlet port for connectingsaid outlet space to the outlet or the cooler; a valve device in saidinlet chamber comprising supporting means having a first piston spacedfrom and aligned with said first valve opening, a second piston spacedfrom and aligned with said second valve opening, a first cylindric valveelement slidable on said first Piston and having an annular end portionto close said first valve opening, a second cylindric valve elementslidable on said second piston and having an annular end portion toclose said second valve opening, and thermostat means on said supportand exposed to the heat of the oil in said inlet chamber for moving saidfirst valve element toward said first valve opening in response to adecrease in the temperature of the oil insaid inlet chamber and formoving said second valve element toward said second valve opening inresponse to an increase in the temperature of said oil in said inletchamber; and means operating in response to excess pressure in saidinlet chamber to move said first valve element into closed relation tosaid first valve opening.

3. In a flow control for an oil cooler having an inlet and an outlet forthe oil, the combination of: walls forming an inlet chamber connectedthrough a valve opening to a cooler inlet port arranged forconnection tothe cooler inlet, an outlet space connected to said inlet chamberthrough a second valve opening, a cooler outlet chamber connected tosaid outlet space through an intercommunicating port and having a cooleroutlet port arranged to connect said outlet chamber with said outlet ofsaid cooler, and bypass means to provide communication between saidcooler inlet port and said cooler outlet chamber; a valve device in saidinlet chamber comprising supporting means having a, first piston spacedfrom and aligned with said first valve opening, a second piston spacedfrom and aligned with said second valve opening, a first cylindric valveelement slidable On said first piston and having an annular end portionto close said first valve opening, a second cylindric valve elementslidable on said second piston and having an annular end portion toclose said second valve opening, and thermostat means on said supportand exposed to the heat of the oil in said inlet chamber for moving saidfirst valve element toward 9 said first valve opening in response to adecrease in the temperature of the oil in said inlet chamher and formoving said second valve element toward said second valve opening inresponse to an increase in the temperature of said oil in said inletchamber; means including said first piston operating in response toexcess pressure in said inlet chamber to move said first valve elementinto closed relation to said first valve open-.

ing; and thermostat valve means in said outlet chamber operative inresponse to a rise in temperature in said outlet chamber to close saidbypass means.

4. In a fiow control for an oil cooler having an inlet and an outlet forthe oil, the combination of: walls forming an inlet chamber connectedthrough a valve opening to a cooler inlet port arranged for connectionto the cooler inlet, an outlet space connected to said inlet chamberthrough a second valve opening, and a cooler outlet port for connectingsaid outlet space to the outlet of the cooler; a valve device in saidinlet chamber comprising supporting means having a first piston spacedfrom and aligned with said first valve opening, a second piston spacedfrom and aligned with said second valve opening, a first cylindric valveelement slidable'on said first piston and having an annular end portionto close said first valve opening, a second-cylindric valve elementslidable on said second piston and having an annular end portion toclose said second valve opening, and thermostat means on said supportand exposed more heat of the oil in said inlet chamber for moving saidfirst valve element toward said first valve opening in response to adecrease in the temperature of the oil in said inlet chamber and formoving said second valve I element toward said second valve opening inre-' sponse to an increase in the temperature of said oil in said inletchamber; and means including said first piston operating in response toexcess pressure in said inlet chamber to move said first valve elementinto closed relation to said first valve opening.

5. In a fiow control for an oil cooler having an inlet and an outlet forthe oil, the combination of: walls forming an inlet chamber connectedthrough a valve opening to a cooler inlet port arranged for connectionto the cooler inlet, an outlet space connected to said inlet chamberthrough a second valve opening, a cooler outlet chamber connected tosaid outlet space through an intercommunicating port and having a cooleroutlet port arranged to connect said outlet chamber with said outlet ofsaid cooler, and bypass means to provide communication between saidcooler inlet port and said cooler outlet chamber; a valve device in saidinlet chamber comprising supporting means having a first piston spacedfrom and aligned with said first valve opening, a second piston spacedfrom and aligned with said second valve opening, a first cylindric valveelement slidable on said first piston and having an annular end portionto close said first valve opening, a second cylin dric valve elementslidable on said second piston and having an annular end portion toclose said second valve opening, and thermostat means on said supportand exposed to the heat of the oil in said inlet chamber for moving saidfirst valve element toward said first valve opening in response to adecrease in the temperature of the oil in said inlet chamber and formoving said second valve element toward said second valve opening inresponse to an increase in the temperature of said oil in said inletchamber; means operating in response to excess pres- 10 sure in saidinlet chamber to move said first valve element into closed relation tosaid first valve opening and move said second valve element into openrelation to said second valve opening; and thermostat valve means insaid outlet chamber operative in response to a rise in temperature insaid outlet chamber to close said bypass means.

6. In a flow control for a cooler having an inlet and an outlet for theoil, the combination of: walls forming an inlet chamber having an inletopening to receive oil to be cooled and a cooler inlet port forconnecting said chamber to the cooler inlet, an outlet space consistingof a first compartment and a second compartment connected by a gate, anintercommunicating port through which connection of said firstcompartment with said cooler outlet ismade, there being a first outletopening for said first compartment disposed in the wall of said outletspace opposite said intercommunicating port, and there being a valveopening connecting said inlet chamber. and said second compartment and asecond outlet opening leading from said second compartment; a cylindricpartition memberconmeeting said intercommunicating port with said firstoutlet opening, said partition member having a wall extending acrosssaid gate so as to isolate said first compartment from said secondcompartment; a check valve in said cylindric partition member tocooperate with said intercommunicating port to prevent a reverse flowthrough said intercommunication port; and valve means responding torelatively low temperature in said chamber to open said valve openingand responding to relatively high temperature in said chamber to closesaid opening.

7. In a flow control for a cooler having an inlet and an outlet for theoil, the combination oi: walls forming an inlet chamber having an inletopening to receive oil to be cooled and acooler inlet port forconnecting said chamber to the cooler inlet, an outlet space consistingof a first compartment and a second compartment connected by a gate, anintercommunicating port through which connection of said firstcompartment with said cooler outlet is made, there being a first outletopening for said first compartment disposed in the wall of said outletspace Opposite said intercommunicating port, and there being a valveopening connecting said inlet chamber and said second compartment and asecond outlet opening leading from said second compartment;

a ,cylindric partition member rotatable on its axis and connecting saidintercommunicating port with said first outlet opening, said partitionmember having a'wall extending across said gate so as to isolate saidfirst compartment from said second compartment and an opening adl'acentsaid wall which will connect said second compartment with the interiorof said cylindric partition member when the same is rotated on its axis;a check valve in said cylindric partition member to cooperate with saidintercommunicating port to prevent a reverse flow through said'intercommunicating port; and valve means :re-

sponding to relatively low temperature in said chamber to open saidvalve opening and responding to relatively high temperature in saidchamher to close said opening.

8. In a flow control for a cooler having an inlet and an outlet for theoil. the combination of:

'walls forming an inlet chamber having an inlet opening to receive oilto be cooled and a cooler inlet port for connecting said chamber to the76 cooler inlet, an outlet space consistingof a first valve openingconnecting said inlet chamber and said second compartment and a secondoutlet opening leading from said second compartment; a cylindricpartition member rotatable on its axis and connecting saidintercommunicating port with said first outlet opening, said partitionmember having a wall extending across said gate so as to isolate saidfirst compartment from said second compartment and an opening adjacentsaid wall which will connect said second com partment with the interiorof said cylindric partition member when the same is rotated on its axis;a check valve in said cylindric partition member to cooperate with saidintercommunicating port to prevent a reverse flow through saidintercommunicating port; valve means responding to relatively lowtemperature in said chamber to open said valve opening and responding torelatively high temperature in said chamber to close said opening; wallsforming a bypass for the flow of oil from said inlet chamber to saidintercomxnunicating port; and a, temperature and pressure responsivevalve device for said bypass normally closing said bypass and respondingto low temperature and also to excess pressure differential between saidinlet chamber and said intercommunicating port to open said bypass.

. RAYMOND W. JENSEN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Germany Sept. 3, 1880

